Attaching the props of cakriagre-bows



NITED STATES PATENT FFKCE.

D. B. WRIGH'1 AND L. SAWYER, OF SOUJJH AMESBURY, MASSACHUSETTS.

ATTACI-IING 'II-IE EROPSOF CARRIAGE-BOWS.

Specificaton of Letters Patent No. 21,391, daced August 31, 1858.

Be it known that we, D. B. WRIGIIT and L. SAWYER, of South Amesbury, inthe county of Essex and State of Massachusetts, have invented a new anduseful Improve1nent in Attaching Props to Carriage-Bows; and we dohereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the annexed dravv ings,making a part of this specification, in which Figure 1, is alongitudinal section of a portion of a carriage bow with our improvementattached to it, showing a side view of ditto. Fig. 2, is an end view ofour imp'rovernent. Fig. 3, is a longitndinal section of a portion of acarriage bow with the usual prop attached to it.

In Figs. 1 and 2 similar letters of reference indicate correspondingparts.

T0 enable those skilled in the art to ully understand and construct ourinvention we Will proceed to describe it.

A, Fig. 1, represents a portion of a carriage bo-W, and B, is a metalplate which is let into the outer surface of the bow, so that the outersurface of the plate Will be flash with the outer surface of the bow.The plate B, has a nut (at) at its center. This nut (a) is formed byhaving a projecting shell on the inner side of the plate said shellhaving an internal screw thread.

C, represents the prop which is of the usual form with the exceptionthat a screw (b) is formed at its inner end and also a shoulder (6) thelatter being somewhat larger in diameter than the screw (b) as plainlyshown in Fig. 1. The screw (1)) is made to fit the nut (a) of the plateB, and when fully screWed into said nut the shoulder (6) bears againstthe plate B.

The shoulder (0) is designed to be about equal in width to the leatheror covering D, Which is fitted over the several bows of the top thecovering being of course over the plate B. A hole (cl) somewhat largerin diameter than the shoulder (0) is made through the covering D,opposite the nut (a) to allow the screw (1)) to pass through. The screw(IJ) is then sorewed into the nut- (a1) and the prop is secured to theloovv.

In Fig. 3, the usual mode of attaching the props to the bows is shovvn.In this case the prop E, is cast or formed with a plate F, through whichscrews (al) pass into the bow G, and through the covering H. Thecovering H, therefore it Will be seen is rigidly attached to the bovv atthe point where the prop is attached consequently the cover ing isliable to wrinkle and is also subjected to oonsiderable strain as thetop is raised and lowered as it is not permitted. to adjust itse1f. Byour irnpr0vement this difliculty is avoided as a requisite degree ofplay or movement is allowed the leather or eovering in consequenoe ofthe hole (cl) being larger in diameter than the shoulder (0). Ourimprovement when attached to the loows have a mach neater appearancethan the ordinary props, and they may be readily detached so as not tointerfere or oier any obstruction to workmen in finishing or in bendingofi the top. Indeed the facility which om invention offers for thefinishing or bending of the top, constitutes a leading advantage of ourinvent-ion.

We are aware that props have been invented in which the prop and plateare cast together, and the plate let in to the bow, so as to be flushwith the surface thereof; an independent shoulder piece heing provided,whioh screws over the prop after the leather has been applied. Thisdevice is liable to serious objeotion from the fact that the leathermust be strained over the pro jecting end of the propa thing vvhich itis impossible to do with nicety, for there Will be more or lesswrinkling. It is moreover very diflicult to out the aperture throughWhich the prop is to pass, with exactitude, owing to the presence of theproj ecting prop. The latter prevents the operator from stretching theleather snugly against the bows, so that the cutting must be done, to acertain extent by guess-work. Considerable time is also lost in theendeavor to obtain a tolerable degree of nicety, and the leather is notunfrequently torn loy catching, during the straining, upon the points ofthe props. A11 suoh diflicult-ies are avoided by the use of ourimprovement. The prop being separate and independent of the plate, thelatter is first let in flush with the surface of the bow; the leather isthen stretched snugly over the bovvs, when the holes may be ina-1nediately and acourately out with a kniit'e, and the props C, may bethen sorewed home.

The superior advantages of our improvement, vvhen the leather requiresIGI1OVEL1 for repair, &-c., vvill be obvious.

We do not claim the employment of a stantially as and for the purposes1erei1 set movable shoulder-pece whch screvvs upon forth. the prop, asin C. Thomass patent; Bui:

D. B. VVRIGHT. We cla1m and des1re t0 secure by Letters 5 Patent, as anmproved artcle of manu- SAWYER' 1 facture' Wtnesses A carrage prop, inwhch the prop C, is EDWARD IIUNIER, rendered. independent of its plateB, sub- J. GRANT.

